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#11
I was also not able to install KB4048955 after trying about ten times. (I would always see the message "awaiting restart" on the Windows Update section in Settings...and restarting wouldn't get rid of that message). When I tried installing the file manually (after downloading it from the Microsoft Update Catalog) I would get the message "We couldn't complete the updates Undoing changes".
I had recently disable the SearchUI and SearchIndexer Processes because they were hogging resources. In an effort to fix the windows update problem, I re-enabled these processes...and after doing so, KB4048955 installed successfully!